单项选择题
Laser-doppler radar（）
A．measures the movements of a spaceship by means of light beam B．makes use of microwaves C．makes use of sound waves D．Both A and B
单项选择题 Which of the following statements is not true according to the passage （）
单项选择题 It can be inferred that （）
单项选择题 Henry Ford changed the American society （）
